Keith Urban 's own words about almost "blowing his marriage to smithereens" have resurfaced in the wake of his split from Nicole Kidman – with friends of the country star telling RadarOnline.com they are "not surprised" the couple have now separated.

The Oscar-winning actress, 58, and the Grammy-winning musician, 57, ended their 19-year marriage this summer, with confirmation of their separation arriving on Monday.

They share two daughters – Sunday Rose, 17, and Faith Margaret, 14 – and had long been considered one of Hollywood's most enduring couples. Article continues below advertisement

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In June last year, Urban stunned th

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